1. Gould, N. I. M.,On the Accurate Determination of Search Directions for Simple Differentiable Penalty Functions, IMA Journal of Numerical Analysis, Vol. 6, pp. 357?372, 1986.
2. Fiacco, A. V., andMcCormick, G. P.,Nonlinear Programming: Sequential Unconstrained Minimization Technique, John Wiley and Sons, New York, New York, 1968.
3. Murray, W.,Analytical Expressions for Eigenvalues and Eigenvectors of the Hessian Matrices of Barrier and Penalty Functions, Journal of Optimization Theory and Applications, Vol. 7, pp. 189?196, 1971.
4. Lootsma, F. A.,Hessian Matrices of Penalty Functions for Solving Constrained Optimization Problems, Phillips Research Reports, Vol. 24, pp. 322?331, 1969.
5. Gerenscher, L.,A Second-Order Technique for the Solution of Nonlinear Optimization Problems, Colloquia Mathematica Societis Janos Bolya 12, Progress in Operations Research, Eger, Hungary, 1976.